package com.lagou.config;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import java.util.Set;

/**
 * @author mcl
 * @date 2021/7/5 2:36 下午
 * @description
 */
public class MySpringServletContainerInitializer implements ServletContainerInitializer {

    @Override
    public void onStartup(Set<Class<?>> set, ServletContext servletContext) throws ServletException {
        servletContext.log("Tomcat 启动过程中注册自己的servlet...");
        // Load Spring web application configuration
        //通过注解的方式初始化Spring的上下文
        AnnotationConfigWebApplicationContext ac = new AnnotationConfigWebApplicationContext();
        //注册spring的配置类（替代传统项目中xml的configuration）
        ac.register(AppConfig.class);
        ac.refresh();

        // Create and register the DispatcherServlet
        //基于java代码的方式初始化DispatcherServlet
        DispatcherServlet servlet = new DispatcherServlet(ac);
        ServletRegistration.Dynamic registration = servletContext.addServlet("dispatcherServlet", servlet);
        registration.setLoadOnStartup(1);
        registration.addMapping("/*");
        servletContext.log("Tomcat 的servlet注册完毕...");

        // TODO: 2021/7/7 这里调用失败
//        MyWebApplicationInitializer myWebApplicationInitializer = new MyWebApplicationInitializer();
//        myWebApplicationInitializer.onStartup(servletContext);
    }
}
